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Structural characteristics of cake layer in membrane bioreactor with chromate exposure.

Abstract：

:Chromate (CrO42-) exposure, especially high concentration (mg/L), still probably occurs in the industrial and mining area due to industrial accidents or even illegal discharge, though CrO42- has been restricted to be discharged into wastewater treatment system (WWTS). Therefore, this study was applied to better understand the structural characteristics of cake layer in membrane bioreactor (MBR), which is one of best alternative for WWTS of industrial or mining area, with CrO42- exposure. Three submerged MBRs with CrO42- exposure (10 mg/L was normal high concentration CrO42-; 50 mg/L as extreme level for better identification; 0 mg/L as control condition) were applied in this study. Results showed that CrO42- exposure caused an obvious variation of cake layer structure. Because of organic component variation, cake layer structure with CrO42- exposure was re-constructed into loose and porous with biomicromolecules, and resulted in the rapid cake layer thickness increase, finally leading to severe membrane biofouling. Additionally, CrO42- distributed evenly along the cross-sectional cake layer. CrO42- only induced the inorganic structure variations of cake layer, but without any obvious effects on the other inorganic elements structure. CrO42- exposure induced the bacterial community structure variation and led to tolerated-CrO42- microorganisms as the majority in cake layer community, but had no obvious effects on the population diversity.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Zhou L,Ye B,Xia S

doi

10.1016/j.ecoenv.2018.11.056

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

583-589

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(18)31192-8

journal_volume

169

pub_type

杂志文章

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